Class 11 Chemistry Chapter 14 Environmental Chemistry MCQ Questions with Answer

Environmental Chemistry Class 11 MCQ is one of the best strategies to prepare for the CBSE Class 11 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQs on Environmental Chemistry Class 11, which will help them all through their board tests.

Environmental Chemistry Class 11 MCQ Question with Answer

Class 11 Chemistry MCQ with answers are given here to Chapter 14 Environmental Chemistry. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 11 Chemistry syllabus. By Solving these Class 11 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 11 Annual exam.

Learn Class 11 Environmental Chemistry MCQs with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 11 Chemistry Environmental Chemistry MCQ with answers given below

Question 1. Which one of the following is not a common component of photochemical smog?
(a) Ozone
(b) Acrolein
(c) Peroxyacetyl nitrate
(d) Chlorofluorocarbons 

Question 2. Which of the following is not correct about carbon monoxide?
(a) It forms carboxyhaemoglobin.
(b) It reduces oxygen carrying ability of blood.
(c) The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
(d) It is produced due to incomplete combustion.

Question 3. Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
(a) N₂O₅
(b) NO₂
(c) N₂O
(d) NO 

Question 4. Which of the following is a sink for CO?
(a) Microorganisms present in the soil
(b) Oceans
(c) Plants
(d) Haemoglobin

Question 5. Which one of the following statements is not true?
(a) Clean water would have a BOD value of 5 ppm.
(b) Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.
(c) When the pH of rain water is higher than 6.5, it is called acid rain.
(d) Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.

Question 6. Which one of the following statements regarding photochemical smog is not correct?
(a) Carbon monoxide does not play any role in photochemical smog formation.
(b) Photochemical smog is an oxidising agent in character.
(c) Photochemical smog is formed through photochemical reaction involving solar energy.
(d) Photochemical smog does not cause irritation in eyes and throat. 

Question 7. Among the following, the one that is not a greenhouse gas is
(a) sulphur dioxide
(b) nitrous oxide
(c) methane
(d) ozone. 

Question 8. About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?
(a) It is beneficial to us as it stops U.V. radiation.
(b) Conversion of O₃ to O₂ is an endothermic reaction.
(c) Ozone is a triatomic linear molecule.
(d) It is harmful as it stops useful radiation.

Question 9. Which one of the following statement is not true?
(a) pH of drinking water should be between 5.5 – 9.5.
(b) Concentration of DO below 6 ppm is good for the growth of fish.
(c) Clean water would have a BOD value of less than 5 ppm.
(d) Oxides of sulphur, nitrogen and carbon, are the most widespread air pollutant

Question 10. The type of pollution caused by spraying of DDT is                           
(a) air and soil
(b) air and water
(c) air
(d) air, water and soil

Question 11. Green chemistry means such reactions which
(a) are related to the depletion of ozone layer
(b) study the reactions in plants
(c) produce colour during reactions
(d) reduce the use and production of hazardous chemicals.

Question 12. Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?
(a) Polyhalogens
(b) Ferrocene
(c) Fullerenes
(d) Freons 

Question 13. The region containing water vapour is                               
(a) thermosphere
(b) stratosphere
(c) troposphere
(d) mesosphere

Question 14. High concentration of which of the following in atmosphere leads to stiffness of flower buds which eventually fall off from plants?                   
(a) NO₂
(b) SO₂
(c) CFC
(d) Smog

Question 15. Which of the following is the coldest region of atmosphere ?                           
(a) Thermosphere
(b) Mesosphere
(c) Troposphere
(d) Stratosphere

Question 16. The region which is greatly affected by air pollution is                           
(a) Thermosphere
(b) Stratosphere
(c) Troposphere
(d) Mesosphere

Question 17. The irritant red haze in the traffic and congested placesis due to presence of which of the following ?       
(i) Oxides of sulphur
(ii) Oxides of nitrogen
(iii) Carbon dioxide
(iv) Mists, smoke and dust
(v) Smog
(a) (i), (iv) and (v)
(b) (iii) only
(c) (ii) only
(d) (ii) and (v)

Question 18. Which of the following is/are the hazardous pollutant(s)present in automobile exhaust gases?                   
(i) N₂ (ii) CO
(iii) CH₄ (iv) Oxides of nitrogen
(a) (ii) and (iii)
(b) (i) and (ii)
(c) (ii) and (iv)
(d) (i) and (iii)

Question 19. What is DDT among the following ?                           
(a) Greenhouse gas
(b) A fertilizer
(c) Biodegradable pollutant
(d) Non-biodegradable pollutant

Question 20. The uppermost region of the atmosphere is called                           
(a) Ionosphere
(b) Stratosphere
(c) Troposphere
(d) Exosphere

Question 21. Increase in global temperature increases the incidence of which of the following infectious disease(s)       
(i) Sleeping sickness (ii) Yellow fever
(iii) Malaria (iv) Dengue
(a) (ii) only (b) (i) and (ii)
(c) (iii) and (iv)
(d) (i), (ii), (iii) and (iv)

Question 22. The green house effect is caused by                                   
(a) CO₂
(b) NO₂
(c) NO
(d) CO

Question 23. The gas emitted by supersonic jet planes that slowly depletes the concentration of ozone layer is             
(a) CO
(b) NO
(c) SO₂
(d) O2

Question 24. Carbon monoxide (CO) is harmful to man because                                       
(a) it forms carbolic acid
(b) it generates excess CO₂
(c) it is carcinogenic
(d) it competes with O2 for haemoglobin

Question 25. Which is related to ‘Green House Effect’?                                       
(a) Farming of Green plants
(b) Farming of Vegetables in Houses
(c) Global Warming
(d) Biodegradable pollutant

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Question 26. The greenhouse effect is because of the                                     
(a) presence of gases, which in general are strong infraredabsorbers, in the atmosphere 
(b) presence of CO₂ only in the atmosphere
(c) pressure of O₃ and CH₄ in the atmosphere
(d) N₂O and chlorofluorohydrocarbons in the atmosphere

Question 27. The quantity of CO₂ in atmosphere is                               
(a) 3.34%
(d) 6.5%
(c) 0.034%
(d) 0.34%

Question 28. The substance which is not regarded as a pollutant?                                 
(a) NO₂
(b) CO₂
(c) O₃
(d) Hydrocarbons

Question 29. Which of the following strategy is not a correct approachto reduce global warming ?                                   
(a) Reducing the green house gas emission by limiting the use of fossil fuels
(b) Increase the vegetation cover particularly the forest for photosynthetic utilization of CO₂
(c) Minimizing the use of nitrogen fertilizers in agriculture for reducing N₂O emission
(d) Increasing the use of air conditioners, refrigeration unit and production of plastic foams and propellants in aerosal spray cans

Question 30. The substance having the largest concentration in acid rain                               
(a) H₂CO₃
(b) HNO₃
(c) HCl
(d) H₂SO₄

Question 31. Green house gases                                   
(a) allow shorter wavelength to enter earth’s atmosphere while doesn’t allow longer wavelength to leave the earth’s atmosphere.
(b) allow longer wavelength to enter earth atmosphere while doesn’t allow shorter wavelength to leave the surface
(c) don’t have wavelength specific character.
(d) show wavelength specific behaviour near the earthwhile far from earth these have wavelength independent behaviour.

Question 32. The greenhouse gas is                                     
(a) CO₂
(b) SO₂
(c) N₂
(d) H₂S

Question 33. Which of the following gases is not a green house gas?                                     
(a) CO
(b) O₃
(c) CH₄
(d) H₂O vapour

Question 34. Which of the following statements is incorrect ?                                                   
(a) Smoke particulates consist of solid or mixture of solid and liquid particles formed during combustion of organic matter.
(b) Herbicides and insecticides that miss their target and travel through air form mists.
(c) Organic solvents, metals and metallic oxides form fume particles
(d) None of these

Question 35. Photochemical smog is due to the presence of                                       
(a) oxides of sulphur
(b) oxides of nitrogen
(c) oxides of carbon
(d) lead

Question 36. Today the concentration of green house gases is very high because of                             
(a) use of refrigerator
(b) increased combustion of oils and coal
(c) deforestation
(d) All of the above

Question 37. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value                       
(a) slightly lower than that of rain water withoutthunderstorm 
(b) slightly higher than that when the thunderstorm is not there
(c) uninfluenced by occurrence of thunderstorm
(d) which depends upon the amount of dust in air

Question 38. Acid rain is due to                                         
(a) CH₃
(b) N₂O₅
(c) SO₂ and NO₂
(d) C₂H₅OH

Question 39. The pH of normal rain water is                                       
(a) 6.5
(b) 7.5
(c) 5.6
(d) 3.5

Question 40. Classical smog occurs in places of                                     
(a) excess SO₂
(b) low temperature
(c) high temperature
(d) excess NH₃

Question 41. The secondary precursors of photochemical smog are                                     
(a) SO₂ and NO₂
(b) SO₂ and hydrocarbons
(c) NO₂ and hydrocarbons
(d) O₃ and PAN

Question 42. The main element of smog is                               
(a) O₃ and PAN
(b) O₃
(c) PAN
(d) PPN and PBN

Question 43. The non-viable particulate among the following is                         
(a) Dust
(b) Bacteria
(c) Moulds
(d) Fungi

Question 44. Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog, identify it.                   
(a) NO₂
(b) O₃
(c) SO₂
(d) Unsaturated hydrocarbon

Question 45. Photochemical smog formed in congested metropolitan cities mainly consists of                                 
(a) ozone, peroxyacetyl nitrate and NO_x
(b) smoke, peroxyacetyl nitrate and SO₂
(c) hydrocarbons, SO₂ and CO₂
(d) hydrocarbons, ozone and SO_x

Question 46. In almost all Indian metropolitan cities like Delhi, the major atmospheric pollutant(s) is/are                         
(a) suspended particulate matter (SPM)
(b) oxides of sulphur
(c) carbon dioxide and carbon monoxide
(d) oxides of nitrogen

Question 47. The pollutants which came directly in the air from sourcesare called primary pollutants. Primary pollutants are  sometimes converted into secondary pollutants. Which of the  ollowing belongs to secondary air pollutants?                                 
(a) C O
(b) Hydrocarbon
(c) Peroxyacetyl nitrate

Question 48. Which of the following statements about photochemical smog is wrong?                               
(a) It has high concentration of oxidising agents
(b) It has low concentration of oxidising agent
(c) It can be controlled by controlling the release of NO₂, hydrocarbons ozone, etc.
(d) Plantation of some plants like pinus helps in controlling photochemical smog.

Question 49. The smog is essentially caused by the presence of                                   
(a) Oxides of sulphur and nitrogen
(b) O₂ and N₂
(c) O₂ and O₃
(d) O₃ and N₂

Question 50. Air pollution causing photochemical oxidants production include                                   
(a) Carbon monoxide, sulphur dioxide
(b) Nitrous oxide, nitric acid fumes, nitric oxide
(c) Ozone, peroxyacetyl nitrate, aldehydes
(d) Oxygen, chlorine, fuming nitric acid

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